6K: An HMI daylight fixture with 6000W lamp output, standard on professional sets. No tungsten equivalent exists at this wattage—tungsten jumps from 5K to 10K.
"6K" is the common shorthand in film lighting for a 6000-watt class spotlight. The designation follows the industry-standard convention of naming lamp heads by their lamp wattage in kilowatts (e.g., 1K, 2K, 5K, 10K). In practice, "6K" almost always refers to a Daylight HMI fixture (discharge lamp, daylight white) with 6000 watts.
Important: Unlike most other wattage classes, there is no standard 6000-watt Tungsten Fresnel. The classic Tungsten Fresnel series runs 1K / 2K / 5K / 10K / 12K / 20K / 24K, skipping the 6K stage – the direct Tungsten neighbor is the 5K (e.g., Mole-Richardson Senior / Baby-Senior 5K). 6000-watt incandescent light exists at most as a PAR/Quartz variant (e.g., Mole-Richardson 6K MolePar), not as a common "6K Fresnel." Therefore, when someone says "6K" on set, they practically always mean the HMI head.
Manufacturers of such 6000-watt HMI heads include ARRI (Compact/Daylight 6000 HMI Fresnel, Arrisun 60 as a 6K HMI PAR), Mole-Richardson (6KW HMI Fresnel Solarspot 6431, 6000W HMI PAR 6651), Cinelight (Compact 6000 HMI), and Filmgear (Daylight Fresnel/PAR 6000W). Both Fresnel and PAR variants are equally common with HMIs.
Caution: Confusion risk: "6K" is also used outside of lighting as a camera resolution format (approx. 6000 pixels horizontally). In the lighting and grip department, however, "6K" refers to the wattage class of a light head.
The central characteristic is the lamp wattage of 6000 watts. Since a "6K" is practically always an HMI head, its properties apply:
For comparison: Tungsten heads produce artificial light warm light (approx. 3200 K) and can be dimmed via voltage without needing a ballast – this type of construction does not occur as a standard Fresnel in the 6000-watt class.
HMI discharge lamps are significantly brighter than incandescent lamps of the same wattage. A 6K HMI roughly delivers the light output of a 24,000W Tungsten Fresnel – this rule of thumb (factor ~4) is provided by manufacturers and dealers for 6000W HMI heads (e.g., ikan/Lightstar LSC-006, described at B&H as "equivalent of a 24,000 W tungsten Fresnel").
6K heads belong to the upper mid-range of lamp wattages and are used for more demanding tasks: as a sun replacement or key light through windows, for illuminating larger areas, or as a hard source over diffusion. Due to their daylight color temperature, 6K HMIs are particularly popular for exterior and mixed-lighting situations.
Due to the high power consumption, the electrical connection is relevant: In North American practice, 6K HMIs are typically supplied via a 60A Bates (Stage Pin) connector. HMI heads also always require a suitable ballast; with non-flicker-free ballasts, attention must be paid to synchronizing the frame rate and shutter angle.
As a cinematographer, I particularly value 6K for the enormous possibilities it offers in image creation – I can zoom in afterwards and recompose the shot without losing sharpness. The higher resolution also gives me more confidence on critical takes, as minor softness or camera shake can be corrected in post.
For me as a director, 6K primarily means creative freedom in post-production – I can adjust shots afterwards and have more options during editing. Especially with documentaries or interviews, it allows me to generate different shot sizes from a static take without having to interrupt the scene.
For me, 6K means higher storage and processing costs, but also a future-proof investment in high-quality source material. I have to weigh the additional costs for storage, backup, and powerful post-production hardware against the creative added value and flexibility – often the effort is justified by fewer shooting days and reshoots.
1. Was beschreibt „6K" am besten?
2. Zu welchem Department gehört „6K"?
3. Wie viele verschiedene Fachperspektiven bietet dieser Eintrag?
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